A client is seeking to catalog 2000 LPs, mostly classical music, and
would dearly love to be able to just store the record label numbers
("Columbia RCA 42713", or whatever) and have the title, composer, and
track info show up in a database.  Such a thing exists for CDs now
(Gracenote, CDDB) but is there anything comparable for LPs?

One further complication: we'd like to be able to catalog these on a
Macintosh running OS9, so if the software is platform based it must be
Mac OS9 compatible.

I assume you want some search capability. Under OS 9, you can use
Excel and just make a large database.

Also, iTunes has a very powerful databasing system for a mere mp3
player. This would be ideal if you are planning on digitizing the
collection. If not, you could create 2,000 one second mp3's with
SoundJam or something similar and use them as host files for the
record information. ITunes uses ID3 tags to store the artist, album,
genre, comments and other items about a song (album in your case) so
this is a possibility.

Hope this helps a little...Good luck. I am envious of that collection.

There are plenty of programs for Mac that would be good if all you
need is a database. Filemaker is a good choice. If, however, you're
looking for a program that automatically fills in information about a
recording using the internet - just by entering in the label and
number (or similar), I don't think you'll have much luck. The closest
I came up with was http://www.gemm.com which searches record dealers.
You can do an detailed search for label and number there. Then it
would take a copy and paste to enter it into a database. But, of
couse, by the time you waited for the web page to load and then copied
and pasted, you could probably enter the data yourself.